METHOD FOR DEVELOPING DEPOSITS OF HARD-TO-RECOVER HYDROCARBONS Russian patent published in 2023 - IPC E21B43/247 

FIELD: oil and gas industry.

SUBSTANCE: invention can be used to improve the efficiency of extraction of hard-to-recover hydrocarbon reserves (TRIZ), in particular, from oil-kerogen-containing formations of the Bazhenov and Domanik formations, as well as for the extraction of natural bitumen, heavy and high-viscosity oils and gas hydrates. A method is claimed for the development of deposits of hard-to-recover hydrocarbons, in which a cluster of horizontal wells is used, the horizontal sections of which are located in the zone of the productive formation, the supply of working agents into the productive formation whereas the target product are selected from it through a casing string, which equips the vertical section of each well. At the first stage of the method, a one-stage hydraulic fracturing of the productive formation and its impregnation with a solvent are carried out on the horizontal section of each well. At the second stage, cyclic pumping of the working agent is carried out in the form of water with a temperature of 374°C to 593°C at a pressure of 22.1 MPa to 70 MPa, and then the same water with its saturation with nanosized particles of metal oxides and hydrogen, for several repeated cycles, during which a well retort is formed in the near-wellbore volume of each well and its volume is increased with each the next cycle until the well retorts merge into a combined retort. At the third stage of the method, at least one well is use for injection, and the rest wells are used for production, and through at least one injection well, the working agent is pumped in the form of a WIADAP liquid and nanohydrothermal fracturing is performed, and then into the combined the retort is pumped with a working agent in the form of water, with a temperature of 40 to 120°C at a pressure of up to 100 MPa, by means of which the target product is displaced from the combined in-situ retort to the daylight surface through production wells in the form of an oil-water emulsion.

EFFECT: increased productivity of the selection of hydrocarbons during field development in combination with a high oil recovery factor (ORF).

2 cl, 8 dwg